gibber vs emit

gibber is a noun but emit is not a noun.

Word	Noun	Adjective	Verb	Adverb
gibber	Yes	No	Yes	No
emit	No	No	Yes	No

As verbs, emit is a hypernym of gibber; that is, emit is a word with a broader meaning than gibber:

Other hypernyms of gibber include let loose, let out, utter.

gibber (noun)	emit (noun)
unintelligible talking

gibber (verb)	emit (verb)
speak (about unimportant matters) rapidly and incessantly	expel (gases or odors)
chatter inarticulately; of monkeys	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.